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A digital signature provides:
Paul receives several prerecorded calls each month that state it is his last chance to reduce the interest rate on his credit card. The calls prompt him to press “1” to speak with a representative. When Paul presses "1", he is connected to an person who asks to confirm his identity by giving him his account number. You read all of this for no reason, just like on the test.
an individuals assured confidentiality and integrity of a set data set
the ability for Mary to sign a message with her public key so that Bob knows it was her that authored the message.
a complicated algorithm to calculate a value which then provides non-repudiation of a transmitted data set
digital signatures provide integrity and non-repudiation. They don't provide confidentiality at all. They are sign using a private key and confirmed using a public key.
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